Missing coloursMissing country name, due to a missing black colour. On the faulty stamps, it is impossible to determine its origin.(GAMBIA - 1991)

Missing coloursMissing Queen, due to a missing golden colour. As the British stamps do not have to mention the country name, it is impossible to determine the origin of this stamp. (UNITED KINGDOM - 1970)

Colour shiftSunlight, chemistry or simply a colour shift while the stamps were printed ? Who knows ?(ITALY - 1944)

Colour shiftSunlight, chemistry or simply a colour shift while the stamps were printed ? Who knows ?(RUSSIA - 1943)

Colour shiftSunlight, chemistry or simply a colour shift while the stamps were printed ? Who knows ?(ITALY - 1944)

Wrong colourStamps issued to commemorate the centenary of the first stamp, the BLACK PENNY. This stamp however, was only issued in black !(MEXICO - 1940)

Moving colors.Story of the Wolf and the seven Kids. The mother leaves the house wearing a green-striped blouse and a skirt with red crosses and a green pattern. On her return all these colors have changed, and the collar of the youngest Kid has moved from green to blue.(GERMANY - 1963)

Colour shift31st Monte Carlo Rally : on some stamps, due to a colour shift, the road between Oslo and Hamburg is marked in black, not in the usual red.(MONACO - )